Intracranial epidermoid cyst
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There is a large extra-axial lobulated lesion in right cerebello-pontine angle, insinuating along the basal cisterns extending to perimesencephalic cistern and right temporal region. This causes significant regional mass effect, compressing and splaying the brainstem (mainly midbrain and pons), shifting it to left side, and displacing the temporal lobe laterally. It extends to the suprasellar cistern, abutting the ipsilateral cavernous sinus. The basilar artery is seen in the mid prepontine cistern with normal signal void appearance.
This lesion appears hypointense in T1W and hyperintense in T2W images, heterogenously hypointense in FLAIR sequences, and shows restricted diffusion on DW/ADC. No enhancement on T1W post contrast.
Extra-axial cerebellopontine angle cystic lesion, insinuating along basal cistern, appears heterogenous on FLAIR sequences with restricted diffusion but no enhancement, suggestive of epidermoid cyst.